Permalink : http://hdl.handle.net/2115/55012

海洋生物相により生成される硫化ジメチル（DMS）は, 大気中の酸化反応を経て雲凝結核（CCN）となる硫酸エアロゾル粒子を生成する. したがってDMS放出量変化は地球の放射収支に影響を与える可能性があり, 海洋生物圏と雲と気候のリンクに関する仮説（CLAW 仮説）が1987年に提示された. その後, この仮説の検証を通してDMSの研究が大い進展したが, このリンクの複雑さゆえに現時点でこの仮説の検証の最終的な結論はでていない. 本稿では, これまで行われた多くの研究成果をもとに, DMS研究の進展と現状について整理することを試みた. また, モデルを用いた将来の気候下でのDMSの応答に関する研究結果も取り上げ, DMSの気候調節の可能性を調べた.
Dimethylsulfide (DMS) produced by marine biota is transformed to sulfuric acid aerosol by oxidation reactions in the atmosphere. Since sulfuric acid aerosol serves as a cloud condensation nuclei(CCN), change in the DMS emission might affect global radiation budget. Hence the CLAW hypothesis regarding the link of marine biosphere-cloud albedo-climate was propsed in 1987. Then, through verification of this hypothesis, research on DMS has considerably progressed. At the present, however, the final conclusion of this verification is not drawn because of the complexities of the processes involved in this hypothesis. In this paper, the progress and current status of research on DMS was summarized based on many results of this study performed thus far. In addition, the results of many studies on the responses of DMS under the future climate using earth system models were summarized and the possibility of climate regulation by DMS was discussed.